Portable visual-aid or display device

ABSTRACT

A rectangular portable carrying and display case of the attache type, adapted to stand vertically, is provided with a fully detachable front cover which is attached at the rear during use. At the front of the case, with the cover removed, a picture frame cover plate provides a viewing opening for observing visual-aid or display material in the form of a strip of paper or the like made up of individual elements or frame units connected end-toend in a reel which is passed across the framed opening between two spaced rollers to display the information carried by each unit. Motor drive means with a hand-held control switch, and including overrunning clutches and belt drive for each roller, is connected therewith in a manner to wind the reel from one roller to the other in a forward direction past the viewing opening or to rewind it in the opposite direction.

[ Dec. 25, 1973 Primary Examiner-Robert W. Michell AssistantExaminer-Vance Y. Hum Attorney-Morton C. Jacobs [57] ABSTRACT Arectangular portable carrying and display case of the attache type,adapted to stand vertically, is provided with a fully detachable frontcover which is attached at the rear during use. At the front of thecase, with the cover removed, a picture frame cover plate provides aviewing opening for observing visual-aid or display material in the formof a strip of paper or the like made up of individual elements or frameunits connected end-to-end in a reel which is passed across the framedopening between two spaced rollers to display the information carried byeach unit. Motor drive means with a hand-held control switch, andincluding 302 Carriage 40/31, 40/87 G09f 11/29 40/31, 87, 88; 242/673,67.4, I88

United States Patent [191 Jacoby et a].

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PATEHTED DEC 2 5 I975 SHEET 2 BF 2 (NVENTORS JOSEPH M. JACOBV v wewmvGELAK ATTORNEY 1 PORTABLE VISUAL-AID OR DISPLAY DEVICE SUMMARY OF THEINVENTION The present invention relates to visual-aid devices forimproving the effectiveness of talks and sales presentations, byvisually imparting supplemental information relating to the subjectthereof.

The present invention is especially adapted for portable visual-aiddevices for use with individuals and small groups, and is also adaptedfor use where the visual-aid information is carried on an elongatedstrip of sheet material for viewing as it is drawn from a reel. Withvisual-aid or display devices of the reel type, the use of an elongatedstrip of sheet material poses the problem of imprinting or otherwisemarking the visual-aid information thereon over its length, and theproblem of how to change any of the elements of such information or theorder of presentation thereof when desired.

With visual-aid or display devices of the standard flip-chart type, theindividual charts or pages are readily imprinted or marked, and theorder of presentation may be changed at will. It thus has the advantageof ease of preparation and flexibility in use. However, the awkwardnessand inconvenience of the standard flip chart, easel and large pages,both in use and in storage,

is a disadvantage not shared by the reel type device, which is compactand convenient to use.

It is a primary object of this invention, therefore, to provide animproved visual-aid device in which the compactness and convenience ofthe reel type is combined with the ease of preparation of the visual-aidinformation and flexibility in use of the flip-chart type, without thedisadvantages of either.

.Another object is to provide a new and improved portable visual-aiddevice.

Another object of this invention is to provide an improved visual-aiddevice of the reel type which facilitates the scanning of an elongatedstrip of sheet material and whereby visual-aid information or datacarried by said strip may be applied thereto and arranged therein, forviewing in any orderly and controlled sequence.

A further object of this invention is to provide an improved visual-aidor display device of the reel type having an improved motor drive meansand control for the reel and the display of visual-aid informationthereby.

A further and important object of the invention is to provide animproved visual-aid or display device of the type referred to, which isportable and light-weight and is adapted for mounting in a standard sizecarrying case of the attache type and for standing firmly in use on adesk or conference table for talks and sales presentations withindividuals or small groups, thereby avoiding the normal separationbetween a speaker at a flip chart, for example, and an audience somedistance away.

In accordance with one embodiment of the invention, a portablelight-weight visual-aid or display device is provided and mounted in astandard size carrying case, similar to a large attache case, which isadapted to stand on a desk or conference table in use. The carrying caseis rectangular and is provided with a detachable front cover which isattachable to the back of the case for improved appearance and toprovide a broad and stable base for standing firmly upright. In theclosed or the open position, on the front or the back of the case, thedetachable cover is attached by means of four clasps which grip andclose on aligned legs on the top and ends of the case along the frontand the back.

At the front of the case, with the cover removed, a picture frame coverplate provides a rectangular viewing opening for observing visual-aid ordisplay material which is passed by the opening. The visual-aid materialor information is carried in successive display areas on an elongatedstrip of paper or other suitable sheet material in a reel which ispassed between two spaced rol lers positioned above and below theopening and in rear of the cover plate.

Motor drive means, under control of an external handheld switch or thelike, is connected with the rollers and includes a flexible drive beltfor each roller connected therewith through an overrunning or slipclutch of the type having oriented clutch facings for transmittingrotary motion in one direction while slipping in the opposite direction.The motor drive means thus operates in a manner to wind the reel fromone roller to the other in one direction past the viewing opening or torewind it in the opposite direction. The motor drive means may alsoinclude motor control elements for positioning the successive displayareas within the frame viewing opening without operator control.

The elongated strip of visual-aid material for the reel is of compositeconstruction, comprising individual rectangular units or elements ofsheet material, which may be standard size paper sheets, imprinted orotherwise marked to carry the desired visual-aid material orinformation, and then joined together end-to-end to provide thesuccessive display areas in a desired sequence for frame-by-framepresentation in the viewing opening. Each sheet or unit is provided witha narrow strip of pressure or moisture sensitive adhesive along the topor bottom edge for attachment or joining together in any desiredsequence for different talks and sales presentations.

There are many advantages in the individual sheet or unit constructionin the preparation of visual-aid material of this type, some of whichare as follows:

1. The sheets or units are readily adapted for duplication in quantityat one time and for temporary storage in stacks before use.

2. The sheets or units may be collated in any order in composing asequence of visual-aid material into a complete reel for use in a talkor presentation.

3. The sheets or units for a given talk or sales presentation may beprinted, collated, and joined in sufficient quantity to provide as manyreels as may be desired for any simultaneous or widespread use of thesame visualaid material.

- The invention will, however, be furtherstood from the followingdescription, when considered with reference to the accompanyingdrawings, and its scope will be pointed out in the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings;

FIG. 1 is a frontal view, in perspective, of a portable visual-aid ordisplay device embodying the invention and shown in the closed orcarrying condition;

FIG. 2 is a similar frontal view, in perspective, of the visual aid ordisplay device of FIG. 1 in the open or operative condition as providedin accordance with the invention;

FIG. 3 is a further frontal view, in perspective, of the device of FIGS.1 and 2, and on an enlarged scale therefrom, with certain portionsremoved or broken away to show the interior construction and furtherfeatures of the invention;

FIG. 4 is an exploded frontal view, in perspective, of certain displayelements of the device showing their operative relation and constructionin accordance with the invention;

FIGS. 5 and 6 are detail side and end views, respectively, of a portionof FIG. 3, on an enlarged scale, showing certain driving elements andthe construction and arrangement thereof in accordance with theinvention; and

FIG. 7 is a schematic circuit diagram showing the electrical control andoperating elements of the visualaid and display device of FIGS. 1, 2 and3 as arranged and provided in accordance with the invention.

DESCRIPTION OF A PREFERRED EMBODIMENT Referring to the drawings, whereinlike reference numerals refer to like parts throughout, and referringmore particularly to FIGS. 1 and 2, a light-weight rectangular carryingcase 10 of the attache type, adapted to stand upright as shown, isprovided with a top carrying handle 11 and a detachable front cover 12.It provides a complete housing or casing for the device, and whenclosed, as in FIG. 1, gives the appearance of a large attache case; inone form it is approximately 5 feet X 14% feet X feet in size, and it isadapted for smaller dimensions as well. It is thus easily portable andtakes up a relatively small area of a desk or table on which the deviceis used.

The front cover is designed to be completely removed or detached fromthe front of the case to fully expose the viewing area and to bereattached to the back of the case, as in FIG. 2, for stability instanding and for improved appearance. In the closed or the openposition, on the front or the back of the case, the detachable cover isarranged to be attached by means of releasable clasps 13, whichpresently are four in number, preferably with two at the top and one oneach side, as indicated. The clasps grip and close on aligned duplicatelugs 14 and 14" on the top and sides of the case along the front andback edges, respectively, in pairs as shown. This permits the cover tobe switched from the front to the back of the case using the same set ofclasps. This construction greatly simplifies setting up the device foruse and closing it again for travel. Furthermore, with the cover ineither position, this construction also provides a relatively wide andstable base for the device when set down either in travel or in use. Foradded stability and support when the case is set down with thedetachable cover in either position, the base of the cover is preferablyprovided with two rubber or like footing buttons or feet 15, one at eachend, and the base of the case is likewise provided with four more feet16, two at each end.

A picture frame cover plate 17 of molded or like plastic material fitsinto the front of the case to provide a rectangular viewing opening 18therein and marginally masks the interior and operating elements, sothat with the cover removed, as in FIG. 2, only the visual presentationor display at the viewing opening 18 is visible, as indicated by thelegend, along with the necessary electrical connection and controlelements 19, 20 and 21, which project through openings in the coverplate at one side of the viewing opening. For opening up the case whendesired, the cover plate is detachably mounted in the case by suitablemeans such as snap-on or push-pull button fastener elements 22 near eachcorner thereof.

Referring now more particularly to FIGS. 3 and 4, the operative elementsof the visual-aid or display device are mounted in the case 10 behindthe framing cover plate 17 of which only the viewing opening 18 isindicated by a dot-dash line, in order to better show said elements andthe interior of the case. These elements include an electric drive motor25 having a shaft 26, a pair of reel spools or rollers 27 and 28 for thevisual-aid material, and a roller drive mechanism 29 connecting themotor with the rollers. The latter comprises two drive shafts 30, onefor each of the rollers, located frontally of the case and at one sidethereof near the top and the bottom in position to drive the rollers,located above and below the opening 18, and in substantially parallelrelation as shown in FIG. 4.

Each shaft is provided with a pulley 31 (FIGS. 3 and 5) at one end and acoupling or drive plate 32 for the roller at the other end, togetherwith an intermediate overrunning or slip clutch 33 therebetween. In thepresent example, these are oriented to drive in the direction ofrotation indicated by the arrows and'to slip in the opposite directionof rotation. The motor, which is of the reversible type, as located withthe motor shaft 26 substantially midway between the two roller driveshafts 30 and is provided with a drive pulley 34 connected with theroller shaft pulleys 31 by two flexible web or rubber belts 35.

The operative elements of the device as above described may be mounteddirectly in the case or be carried on a frame or chassis 37 which isadapted for mounting in and attachment to the interior of the carryingcase, as shown in FIG. 3. The frame or chassis includes two widelyspaced parallel end plates 38 and 39 at either side of the viewingopening 18, between which the rollers 27 and 28 are mounted, and a thirdend plate 40 outside of and closely adjacent to the end plate 39 so thatthey support the two roller drive shafts between them, one near the topand one near the bottom, in teflon or like plug type bearings 41provided therefor in the plates. The motor 25 is mounted adjacent to thedrive mechanism 29, being attached to the inside of the end plate 39with the shaft extending therethrough and through the end plate 40 tothe pulley 34 in alignment with the pulleys 31 for the roller driveshafts.

Also carried by the frame or chassis remote from the drive mechanism, onthe opposite end plate 38 and in axial alignment with each of the rollerdrive shafts 30, is a spring pressed, circular seat or holding plate 42and centering pin 43 for each spool or roller. As shown in FIG. 4, therollers are each of the same tubular construction with flanged ends 44in which are provided center apertures or holes 45 for the centeringpins 43 at one end and, at the opposite end, for the protruding driveshaft ends as centering pins in the coupling or drive shaft plates 32.

The rollers are thus mounted on the centering elements or pins andresiliently held against the coupling or drive plates 32 by thespring-pressed holding plates or seats 42. To provide a positive drivingconnection between each roller and the drive plate therefor, the flangedends 44 of the rollers are further provided with a circular array ofspaced apertures 46 surrounding the centering aperture 45 at each endfor receiving a drive pin 47 projects from the face of the drive plate32. By this arrangement, with the framing cover plate 17 detached, therollers mayreadily be inserted in or removed from the device as requiredto change the visual-aid material in preparing for different talks orpresentations.

The visual-aid material indicated by the legends in FIG. 4 is carried onan elongated strip of paper or like sheet material 49 for the reel whichis attached at each end of the rollers above and below the viewingopening 18, and is drawn or reeled from one to the other across theopening in a flat plane over a fixed backing plate 50 directly in rearof and close to the viewing opening 18. The backing plate is attached tothe two chassis plates 38 and 39, and is a rectangular fiat sheet ofplastic or like material with upper and lower edges 51 curved inwardlytoward the rollers to direct the reel strip smoothly onto and off theplates in either direction while maintaining it flat directly behind theviewing opening 18.

The backing plate 50 is detachably mounted (for ready removal, forservicing the interior elements of the device) on integral narrowbrackets 52 on the forward edges of the end plates 38 and 39 by snap-onfasteners 53. Narrow bracket elements 54 inside the case on each sidehave holes for receiving the button fasteners 22 therein as indicated.

Also attached to and carried by the chassis are the electricalconnection and control elements 19, and 21 which are located on theopposite side of the chassis from the motor drive elements and mountedon a common supporting panel 55 attached to the outside frontal edge ofthe end plate 38. In this way the elements 19, 20 and 21 are grouped atone side of the viewing opening in rear of the cover plate and projecttherethrough, as shown in FIG. 2, for connection and operation with thefront cover removed. The element 19 is a three-terminal plug for aninput power supply cord connection, the element 20 is a three-terminalreceptacle or jack for a remote control connection cord, and the element21 is a push-button type reversing switch for the motor, all as will beshown and described hereinafter.

An additional control element is provided as part of a sensing means forautomatically stopping the motor and the reel movement to position thevisual displays on the reel strip 49 in registration with the viewingopening 18, which, in the present example, is a motor control switch 56located on the end plate 39 adjacent to the backing plate 50 and reelstrip as it moves thereover, and is provided with a movable operatingarm 57 having a stop sensing element or button 58 at the outer end whichextends through the backing plate into contact with the reel strip 49 tosense and be operated by cooperating stop openings 59 disposedlengthwise along the edge, as will further be described hereinafter.

Referring more particularly to FIG. 4, the desired display material orinformation for one or more talks or sales presentations on the same ordifferent subjects may be written, printed, marked, or otherwise appliedto individual rectangular units 60 of sheet material in any desiredquantity, and joined together in end-to-end relation in any desiredsequence to make up successive display areas in any number of continuousreel strips, such as 49, as may be desired. This display reel system isthus very flexible and convenient in preparation and use, and permits asmany as twenty-five units to be provided in a reel strip, which is morethan is generally required for many talks and presentations.

Thus the elongated strip of visual-aid or display material is ofcomposite construction, preferably comprising regularly available unitssuch as standard size, 8% feet ll feet paper sheets, for example, whichare easily handled and imprinted or otherwise marked in quantity andcollated for any desired sequence in different reels. In any case, thedimension of each unit or sheet is greater than the viewing opening 18in the cover plate, in order to fill the opening fully. In case a largerdisplay and viewing opening is required, the dimensions of the units orsheets may be correspondingly larger within the limits of the size ofthe carrying case. Each unit or sheet has a narrow strip 61 of pressureor moisture sensitive adhesive along one edge at the top or the bottomfor overlapping and joining together of the several units or sheets of asequence into the continuous reel strip 49, the units or sheets being inend-to-end relation as indicated by the dotted lines. With thisconstruction, the stopping or positioning elements 59 for each reelstrip may preferably be provided along the latter at the junctions ofthe units or sheets, as shown, where the adhesive strips provideincreased thickness and strength for the strip.

The reel strip is made up, preferably, to be reeled from the lowerroller 27 to the upper roller 28 so that the successive displays ordisplay areas in the sequence move up into the viewing opening 18.However, if desired, the units of the reel may be arranged in theopposite order for sequential display in the opposite direction ofmovement. In any case, the framing cover plate 17 focuses the attentionon the exposed portion of the reel strip which is the visualpresentation or display.

Referring to FIGS. 5 and 6 along with FIG. 3, further consideration maybe given to the construction and operation of the clutches 33. Theseelements permit the rollers 27 and 28 to be driven in oppositedirections by the single reversible motor 25, and for this purpose arepreferably of the oriented fiber type, as this type is of small size, iseasily constructed at low cost, and is effective and long lasting inuse. A commercially available clutch of this type which has been foundto be satisfactory for the present use is the 3M Fibre-Tran overrunningclutch. The clutches 33 are of this type and are of like constructionthroughout, but are oriented to drive in opposite directions, asindicated in FIG. 3. One of these clutches, as shown in FIG. 5, may beconsidered to be the upper clutch element oriented for driving the upperroller in the foreward direction.

The clutch 33 is located between the end plates 39 and 40 and the shaftbearings 41 therein, and comprises two circular parts: an oriented fiberface or disc 63 and a fine metal screen face or disc 64 in contactingengagement. Each face or disc is adhesive backed for attachment tocircular backing plates 65 connected with the drive pulley 31 and theroller drive plate 32 through the shaft on each side. As indicated inFIG. 5, the fibers on the face or disc 63 are oriented to permitslippage in one direction and to catch on the screen face or disc 64 anddrive in the opposite direction. As in the present example, the driverelement is generally connected with the screen face or disc while thedriven element is connected with the oriented fiber face or disc.

With the fibers in the face or disc 64 oriented as indicated in FIG. 5,it will be seen that the clutch 33 drives the upper roller 28 when themotor rotates in the forward direction indicated in FIG. 3, and slipswhen the motor is reversed. The fibers of the clutch for the lowerroller 27 are oriented in the opposite direction for driving when themotor is reversed. The oriented fiber clutch faces or discs are thusmounted in opposition so that, when the upper clutch engages to drivethe reel in the forward direction, the lower clutch slips, while forrewind of the reel in the opposite direction, the lower clutch engagesto drive and the upper clutch slips. The use of two oriented fiber typeoverrunning or slip clutches, in conjunction with a single reversiblemotor, thus greatly simplifies the construction and operation of thedevice.

Referring now to the circuit diagram of FIG. 7, wherein the case 10 isindicated in dotted lines, the driving motor 25 is reversible and isprovided with a forward winding 66 and a reversing winding 67, bothconnected with a common terminal 68 and having respective individualterminals 69 and 70. The motor is preferably of the low-speed,high-torque, silent type, AC operable and of relatively small size tofit into the limited space provided by the carrying case.

The three-terminal power plug 19 is connected through one lead 71 withthe common motor terminal 68 and through the other lead 72 with oneterminal 73 of the remote control receptacle and the motor reversingterminal 70 through the push-button switch 21. The third lead 74 fromthe plug 19 is the ground lead connected to chassis ground 75. A powersupply cord 76 of suitable length is provided for the device and, whenthe device is set up for use as in FIG. 2, the cord is attached to thepower plug 19 by a push-on receptacle 77 at one end and at the other endis provided with an input plug 78 for an electrical wall outlet.

The two remaining terminals 79 and 80 of the remote control receptacleor jack 20 are both connected with the motor forward terminal 69, thefirst directly through a connection lead 81 and the second indirectlythrough a connection lead 82 and the stop switch 56 which is biased tobe normally open. When the reel strip 49 is moved in changing thedisplays, it depressed the element or button 58 on the movable operatingarm 57 and holds the switch closed, as indicated in FIG. 7. The switchis positioned so that the stop sensing element or button meets a stopelement 59 on the reel strip and drops into the opening to release thearm and open the switch, as indicated in dotted lines, each time adisplay area on the reel strip is in registration with the viewingopening.

A hand-held switch 84, on the end of a remote control connection cord85, is provided for activating the motor and controlling the reel stripmovement. The switch is of the two-way type having an intermediateneutral or off" position from which it is moved in either of twodirections, as indicated, by a thumb piece 86 connected with a contactelement 87 which is movable thereby into engagement with one or theother of two fixed contacts 88 and 89. The opposite end of theconnection cord 85 is provided with a connection plug 90 adapted to pluginto the remote control receptable or jack 20, as indicated, and tocomplete circuit connections between the fixed switch contacts 88 and 89and the receptacle terminals 79 and 80 respectively, and between themovable switch contact element 87 and the receptacle terminal 73. Themovable contact element is thus connected with the lead 72 while bothfixed contacts are connected with the motor forward terminal 69, thecontact 88 being connected directly and the contact 89 being connectedindirectly through the stop switch 56.

Both motor windings are connected through the common terminal 68 withthe lead 71 so that, with the other lead 72 connected with the movablecontact element 87, closing of the hand control switch 84 in eitherdirection will energize the motor in the foward direction if the stopswitch 56 is closed. When closed to the contact 88, the motor willoperate to move the reel strip in the foward direction continuouslyuntil it is released and opens. For rewinding the reel strip, thepush-button reversing switch 21 is closed to energize the reversingwinding 67 of the motor and is released when the operation is completed,to stop the motor.

For automatic stopping by the stop sensing means, the control switch 84is first momentarily closed to the contact 88 to start the motor andmove the reel strip off a stop position, and thus permit the stop switchto be closed thereby. The control switch may then be shifted to theclosed position in the opposite direction to energize the forwardwinding 66 through the contact 89 and the stop switch which opens andstops the motor and the reel strip movement when the switch stop sensingelement meets the next stop element on the reel strip, as describedhereinbefore. Thus the successive displays on the reel strip may bepositioned in registration with the viewing opening without assistanceof the operator so that full attention may be given to the talk orpresentation relating thereto.

From the foregoing description, it will be seen that the portablevisual-aid or display device of the present invention is of improved andcompact construction providing flexibility and convenience in thepreparation and use of visual-aid or display material for talks andsales presentations with individuals and small groups, and facilitatesthe scanning and control of such material in use.

What is claimed is:

l. A portable visual-aid device comprising:

a light-weight rectangular carrying case adapted to stand upright on adesk or conference table, said case including separate front and backhardware elements, and a fully detachable front cover adapted forattachment to the back of said case and having common hardware elementsfor attaching it to said front and back hardware elements in eitherposition front or back interchangeably;

a picture frame plate in the front of the case, and exposed bydetachment of the front cover, providing a rectangular viewing openingfor observing visualaid material therethrough; and means for presentingsuccessive frames of visual-aid material in the viewing opening of saidpicture frame plate, said frame presenting means including:

a pair of reel drive rollers in the case above and below said viewingopening;

an elongated strip of sheet material comprising individual rectangularunits bearing visual-aid or display information and connected inend-to-end relation in a reel extending from one roller to the otheracross said viewing opening;

motor drive means having a hand-held control switch and including asingle reversible electric motor with an individual oriented fiber typeoverrunning clutch and belt drive for each roller connected therewith toalternately drive one roller or the other and to wind the reel strip ina forward direction from one roller to the other past the viewingopening and to rewind it in the opposite direction; motor control meansfor stopping the successive display units in position within the viewingopening and means connecting said hand-held switch to apply operatingcurrent directly to the motor or indirectly thereto through the stopswitch.

2. A portable visual-aid device as recited in claim 3,

without operator control and including corre- 5 wherein the individualrectangular units of the reel strip sponding successive stop elementsalong the reel strip and a stop switch for the motor having astopsensing operating element positioned to meet said stop elements andoperate the switch for each stop position;

are standard size paper sheets having dimensions greater than theviewing opening and joined together by self adhesive elements carriedthereby along one edge.

' i223? I UNITED STATES PATENT 0min CERTIFICATE 0F flommm'mm fatent No.3 78O458 Dated 5 1 973 invenwfls) Joseph M. Jacoby, Richard Gelak It iscertified that error appears in the above-identifie d patent and thatsaid Letters Patent are hereby corrected as shown below;

v Col; line 5 ff' t should be further understood- Col. 10, line 4, claimifs" should be 1 Signed and sealed this 8th day of October 1974o (SEAL e,Attest; c. MARSHALL mum MCCOY M. GIBSON JR. e I Attesting OfficerCommissibner of Patents

1. A portable visual-aid device comprising: a light-weight rectanGularcarrying case adapted to stand upright on a desk or conference table,said case including separate front and back hardware elements, and afully detachable front cover adapted for attachment to the back of saidcase and having common hardware elements for attaching it to said frontand back hardware elements in either position front or backinterchangeably; a picture frame plate in the front of the case, andexposed by detachment of the front cover, providing a rectangularviewing opening for observing visual-aid material therethrough; andmeans for presenting successive frames of visual-aid material in theviewing opening of said picture frame plate, said frame presenting meansincluding: a pair of reel drive rollers in the case above and below saidviewing opening; an elongated strip of sheet material comprisingindividual rectangular units bearing visual-aid or display informationand connected in end-to-end relation in a reel extending from one rollerto the other across said viewing opening; motor drive means having ahand-held control switch and including a single reversible electricmotor with an individual oriented fiber type overrunning clutch and beltdrive for each roller connected therewith to alternately drive oneroller or the other and to wind the reel strip in a forward directionfrom one roller to the other past the viewing opening and to rewind itin the opposite direction; motor control means for stopping thesuccessive display units in position within the viewing opening withoutoperator control and including corresponding successive stop elementsalong the reel strip and a stop switch for the motor having astopsensing operating element positioned to meet said stop elements andoperate the switch for each stop position; and means connecting saidhand-held switch to apply operating current directly to the motor orindirectly thereto through the stop switch.
 2. A portable visual-aiddevice as recited in claim 3, wherein the individual rectangular unitsof the reel strip are standard size paper sheets having dimensionsgreater than the viewing opening and joined together by self adhesiveelements carried thereby along one edge.